Matrix.



J. McNAUGHTON.

MATRIX.

APPLICATION FlLED JAN). 3. 1916'.

1,189,150. Patnted June 27,1916.

Witnesses I by 73.74 7 m I T Attorneys Tm: COLUMBIA PLANOORAPH co.. WASHINGTON. D. 6.

Inventor JOHN McNAUGrI-ITON, OF LONDON, ONTARIO, CANADA.

MATRIX.

Specification of Letters Patent.

Patented June 27, 1918.

Original application filed May 5, 1915, Serial No. 26,016. Divided and this application filed January 3,

To all whom it may concern:

Be it known that I, J oHN'lWoNAUoIrroN, a subject of Great Britain, residing at London, in the Province of Ontario and Dominion of Canada, have invented a new and useful Matrix, of which the following is a specification.

This invention relates to a matrix for use in stereotype casting boxes and'is more particularly a division of an application filed by me on May 5, 1915, Serial No. 26,016.

One of the objects of the invention is to provide a matrix particularly designed for use in connection with the casting box disclosed in my application herein mentioned.

A further object is to provide a cupped matrix which, when used, eliminates the necessity of routing the marginal portion of the stereotype produced and which has required the use of special tools and considerable skill.

A further object is to provide a matrix which does not require the use of the tail of tissue or. finishing paper which is usually extended from one end of the matrix, thus materially reducing the cost of producing a matrix not only because of the saving of the paper but of the paste used in afiixing 1t to the backing, the paste and finishing tissue being expensive and the saving being, consequently, considerable where a large number of matrices are produced.

A further object is to provide a matrix raised along three edges so as to produce the desired cupped effect, the fourth edge of the matrix being left flat so as to permit the metal to be poured readily onto the matrix while casting the stereotype.

lVith' the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of themvention herein disclosed, can be made wlthin the scope of what is claimed, without departing from the spirit of theinvention.

In the accompanying drawings the pre ferred form of the invention has been shown.

In said drawings :Figure 1 is a face view of a matrix embodying the present improvements. Fig. 2 is a section on a reduced scale through a casting box and showing the position of the matrix therein. Fig.

Serial No. 69,909.

3 is a section through a portion of the matrix showing how the same is produced in cupped or dished form.

Referring to the figures by characters of reference 1 designates the usual paper backing of the matrix, the same having a finishing thickness of tissue indicated at 2 and which is held to the backing by a special form of paste, the matrix being such as can be purchased in the open market. In producing a matrix such s constitutes the pres ent invention, the printing form F is arranged between the bearing members B disposed along two sides and one end of the form, after which the matrix is pressed down onto the form and bearing members so as to produce a matrix indicated generally at M two sides and one end of which are oflset longitudinally as at O. The other end of the ma trix is left flat and in the same plane with the innermost portions of the cupped or dished part of the matrix. The offset portions 0 are raised beyond any of the other parts of the matrix as will be apparent by referring to Fig. 3. Where two or more cuts are employed in producing an impression in one matrix, raised portions R will be formed on the matrix as shown in Fig. 1, but these raised portions will not be as high as the offsets 0.

hen using the matrix, the same is placed in a casting box C having marginal flanges D along two sides and one end thereof and which are of the same height as the offsets 0. Thus when the matrix is placed in position, it will fit snugly in the box with its offset portions bearing on'the flanges D and with its cupped or dished face exposed. A cover plate E having a lining E of paper or the like is then placed on the box C, this cover having flanges 6 along two sides and one end thereof adapted to cooperate with the flanges D to clamp upon the offset marginal portions of the matrix as shown in Fig. 2. Thus when the molten metal is poured into the casting box it will fill the entire space between the cupped or dished face of the matrix and the lining E with the result that the produced stereotype will have two sides and one end rabbeted without requiring the use of a routing tool as heretofore. Surplus metal such as may be left above the flat portion 0 can be cut off in the usual manner and where impressions are taken from several cuts, as shown in Fig. 1, the stereotype can be cut up along the raised portions 11 to separate the different portions.

What is claimed is A stereotyping matrix dished transversely and longitudinally and having flat offset portions along two sides and one end, the other end being flat and in the same plane with the type forming impressions in the concave face of the matrix, the offset portions of the matrix projecting higher than 10 Copies of this patent may be obtained for five cents each, by addressing the Commissioner of latentl,

Washington, D. 0. 

